Mitsubishi WD-60C9 Firmware update problem

I am new here and am really hoping someone can help me out. I have had my Mitsubishi WD-60C9 for a couple of years now and saw on mitsubishi's website that there was a firmware update for it so I downloaded the file and followed the instructions exactly as far as formatting a usb drive and copying the files to the drive and then the steps for hooking it up to the tv. Now since I have done that all that I get is the blue welcome screen and the green blinking light on the front. According to the instructions it should take approximately 5 minutes and so far I have had the tv on for an hour with no change. Any thoughts, ideas, fixes would be greatly appreciated.